Assembling and evaluating automated assistant responses for privacy concerns

ABSTRACT

Automated assistant responses may be assembled and/or evaluated to address privacy concerns. In various implementations, a free-form natural language input may be received from a first user and may include a request for information pertaining to a second user. Multiple data sources may be identified that are accessible by an automated assistant to retrieve data associated with the second user. The multiple data sources may collectively include sufficient data to formulate a natural language response to the request. Respective privacy scores associated with the multiple data sources may be used to determine an aggregate privacy score associated with responding to the request. The natural language response may then be output at a client device operated by the first user in response to a determination that the aggregate privacy score associated with the natural language response satisfies a privacy criterion established for the second user with respect to the first user.

BACKGROUND

Humans may engage in human-to-computer dialogs with interactive software applications referred to herein as “automated assistants” (also referred to as “chatbots,” “virtual assistants,” “interactive personal assistants,” “intelligent personal assistants,” “personal voice assistants,” “conversational agents,” etc.). For example, humans (which when they interact with automated assistants may be referred to as “users”) may provide commands, queries, and/or requests using free form natural language input which may include vocal utterances converted into text and then processed and/or typed free form natural language input.

There are a variety of situations in which it may be desirable for one person to communicate with an automated assistant serving another user, or least to provide the appearance of communicating with an automated assistant serving another user. Suppose a first user wishes to engage with actions available through an automated assistant serving another user. For example, the first user may wish to control one or more smart devices under the control of another user's automated assistant. Such actions may require information from multiple data sources to ensure compliance with settings established by the second user. In another example, the first user may wish to schedule a dinner with a second user across a multi-day time interval. In order to determine the second user's availability, the first user might call, email, or text the second user. However, the second user may not be available to answer the first user's question, or might prefer not to be interrupted. In such a situation an automated assistant could step in and provide information to the first user about the second user's availability. However, in order to respond to the first user's request—particularly such an open-ended and non-specific request—the automated assistant may need access to multiple data sources storing data associated with the second user. Moreover, at least some of the data sources may store data that the second user may consider private or highly sensitive. For example, most users typically would consider data such as personal online calendars, emails, text messages, etc., to be relatively private and/or sensitive. Additionally, some data necessary to respond to the first user's request may only be available locally on a client device operated by the second user.

SUMMARY

Techniques are described herein for safely responding to requests for automated assistants to act in accordance with information associated with a given user (e.g., a homeowner, or more generally, a user who controls/owns device(s) that provide automated assistant access, also referred to herein as a “subject user”) when the request originates with other users (e.g., guests of the homeowner, or “guest” users operating particular device, also referred to herein as a “requesting user”). In various implementations, a request submitted by a first user that relates to information associated with a second user may be relatively broad and/or open-ended. Satisfying such a request may require access to multiple data sources that store data associated with the second user. Techniques described herein are usable to aggregate individual privacy scores associated with these data sources and/or data obtained from these data sources, and to determine whether (or how specifically) to respond to the request based on the aggregate privacy score.

In some implementations, the automated assistant may formulate a natural language response based on the multiple data from the multiple data sources, and this natural language response may be associated with the aggregate privacy score. Alternatively, the automated assistant may perform an action (such as controlling one or more devices). A determination may be made of whether the aggregate data score satisfies some criterion, such as not exceeding a privacy threshold. If the criterion is satisfied (e.g., the aggregate privacy score does not exceed the privacy threshold), the formulated natural language response may be output by the automated assistant to the requesting user and/or an action requested by the requesting user may be performed.

As an example, suppose Dave submits the following request to an automated assistant: “When is Alice free for dinner?” Alice may not necessarily maintain a comprehensive calendar, particularly for social activities occurring outside of business hours. Accordingly, in order to answer this question the automated assistant may need to access data source(s) beyond Alice's calendar, such as Alice's emails or texts (which may contain communications about upcoming dinner plans), or Alice's current location (which could rule out dinner in the immediate future if Alice is far away).

Suppose Alice previously provided Dave with at least some access to her calendar (or at least signaled that Dave is entitled to an elevated level of trust, generally). That means any data obtained on behalf of Dave from Alice's calendar may be assigned a relatively low privacy score. However, Alice may consider her electronic correspondence and/or current location to be far more private/sensitive. Consequently, data obtained from those sources may have relatively high privacy scores. Suppose the automated assistant is able to determine, using data from all three sources, that Alice is next available for dinner a week from Tuesday. The automated assistant may formulate a natural language response such as “Alice is available for dinner a week from Tuesday.” However, the automated assistant may not yet provide this response to Dave. Instead, the automated assistant may determine and/or evaluate an aggregate privacy score determined from the three underlying data sources, and determine that Alice's privacy criterion with respect to Dave (or at least with respect to this particular request) does not permit the automated assistant to provide this response. Accordingly, the automated assistant may instead tell Dave, “Sorry, I can't provide that information.” In some implementations, the automated assistant (or, technically, another instance of an automated assistant) may meanwhile seek permission from Alice to provide Dave with an answer to his request.

In another example, Dave is visiting Alice at her home. Dave may request an automated assistant to “Turn up the heating”. A data source relevant to this request may provide the current temperature to which a heating system linked to the automated assistant is set. Alice may be willing to share this data with Dave. However, Alice may additionally control her heating in dependence on both a set schedule and her current location. Since, as above, Alice may consider location information to be sensitive, the aggregate privacy score for the data sources necessary to perform the request may be such that Dave does not meet the privacy criterion. If so, the automated assistant may reply “Sorry, I can't help with that” or similar. If Dave does meet the privacy criterion, the automated assistant may enact the relevant action (for example, by instructing the heating system to respond accordingly).

In some implementations, the automated assistant may go ahead and assemble sufficient data to formulate an answer (referred to as “fulfillment information” below), and then present that answer to Alice as part of soliciting permission from Alice to present it to Dave. In some such implementations, Alice could even be presented with audible or visual output that identifies the data sources used to generate the answer, which data points from each data source were used to assemble the answer. That way Alice can see exactly how the answer was assembled and decide whether to permit the answer to be presented to Dave.

In some implementations, subject users' responses to such requests may be used to determine whether future requests should be fulfilled or denied. For example, in some implementations, various aspects of the answer, the data sources used, attributes of Dave, attributes of a relationship between Dave and Alice, etc., may be used to generate a feature vector that is then labeled as a positive or negative training example (depending on whether Alice permitted or denied the request) and used to train a machine learning model. Alternatively, if Alice denies permission, that may be used as a negative training example (i.e., deny access). In either case, the machine learning model (e.g., neural network, support vector machine, etc.) may be trained to generate output that indicates whether or not a requesting user should be provided with information responsive to their request. For future requests, unlabeled feature vectors may be generated based on attributes of the request (e.g., number of words, semantic/syntactic attributes, breadth, etc.), the requesting user, the subject user, a relationship between the requesting and subject user, etc., and applied as input across the trained machine learning model to generate output that indicates whether or not the request should be fulfilled.

In various implementations, different data sources may have different privacy scores. For example, data sources that are available online, e.g., on one or more servers forming what is often referred to as a “cloud” computing system, may have lower privacy scores than, say, data sources that are only available locally on one or more client devices operated by a user. As another example, users may explicitly assign privacy scores to different data sources. For example, a user may elect to make her calendar less private than, say, electronic correspondence. In some implementations, some data sources may arbitrarily or by default be assigned different privacy scores, e.g., based on general notions of privacy and/or sensitivity. For example, most users would likely agree that their personal electronic correspondence (e.g., emails, text messages) are more private than, say, data sources that are at least partially available to others, such as social network profiles. As another example, a user's browsing and/or search history would be considered by most users to be more private than say, a user's song playlist or restaurants that the user has recommended to others.

Additionally or alternatively, in some implementations, data itself, rather than the source it is drawn from, may be used to determine its privacy score. Suppose fulfilling a first user's request requires a second user's credit card information. For example, a son could say something like, “Hey assistant, can you order me a supreme pizza to be delivered from <store_x>. We can use mom's VISA.” Such highly-sensitive information may be assigned a relatively high privacy score, regardless of where it is drawn from. In this example, if the aggregate privacy score does not satisfy a privacy criterion, then the son's request may be denied.

Various criteria may be used by an automated assistant to determine whether to provide a requesting user with information about another user using techniques described herein. As noted above, in some implementations, it may suffice for the aggregate privacy score to fall short of some privacy threshold. In various implementations, such a privacy threshold may be determined in various ways. In some implementations, the privacy threshold may be determined based on a measure of specificity or granularity associated with a user's request, e.g., as a sliding scale. In other words, the breadth of the user's request may be used to determine how strictly it should be scrutinized for privacy concerns. This may reduce the likelihood of the requestor being able to infer specific pieces of information about the other user from general answers.

For example, a request that seeks highly specific information (e.g., “Where will Axel be at 11 PM tomorrow night?”) may be subject to relatively strict scrutiny. The privacy threshold may be set relatively low, and therefore, may be more easily matched and/or exceeded (in which case the request would be denied). By contrast, a request seeking coarser, less specific information (e.g., “Is Cynthia available for Dinner tomorrow or Wednesday?”) may be subject to less strict scrutiny. For example, the privacy threshold may be set relatively high, and therefore, may be more difficult to violate.

A requests' breadth may be determined based on signals other than time slots or locations associated with users. For example, a general or broad request such as “Does George like historical fiction?” may be subjected to less scrutiny (e.g., an aggregate privacy score associated with the response may be compared to a relatively high privacy threshold) than, say, a highly specific request such as “Does George already own an electronic copy of ‘Gone with the Wind’?” As another example, a request such as “Does Antoine like seafood?” may be subjected to less scrutiny than, say, a highly-specific request such as “When has Antoine most recently eaten at <seafood_restaurant>?”

Users often customize various aspects of their automated assistant experiences, e.g., by selecting different voice synthesizers. Techniques described herein may leverage these customizations in order to strengthen the appearance of speaking with another user's automated assistant. For instance, Dave may set his automated assistant client to a male voice, and Alice may set her automated assistant client to a female voice. Consequently, when Dave invokes an instance of an automated assistant (and assuming his identity is ascertained), he hears a male voice. Likewise, when Alice invokes an instance of an automated assistant, she hears a female voice. In various implementations, techniques described herein may be employed such that when Dave invokes seeks to communicate with Alice's automated assistant, the female voice synthesizer employed by Alice may be activated for the automated instance invoked by Dave. Consequently, even though Dave may still be interacting with his own automated assistant client executing on his own computing device, he nevertheless hears the voice of Alice's assistant, effectively providing Dave with the experience of speaking with Alice's assistant.

In some implementations, relatively innocuous information divulged to a requesting user about a particular user (sometimes referred to herein as a “subject user”) may be selectively obscured from the particular user. The subject user may be required to provide some sort of input first before being informed about the requesting user's request and/or the information divulged. This may be beneficial, for instance, for users to be able to buy presents for other users. Suppose a user named Jack asks an automated assistant “Does Mary like peonies?” It would be unfortunate if Mary were immediately informed that Jack had asked this question because she would not be surprised when Jack presented her with peonies.

Accordingly, with techniques described herein, Mary may only be pushed output (e.g., a card on her home screen) informing her that someone asked about her tastes, may have purchased her a present, etc. The output might not specify the request or the responsive information unless Mary takes some affirmative action, such as clicking on the output.

In some implementations, this feature may only be available for users who are deemed highly trustworthy. For example, if a husband asks his wife's assistant for restaurant recommendations for their anniversary, the wife's automated assistant (or in some cases, an instance of an automated assistant presented as serving the wife) may search one or more data sources (e.g., receipt history of the wife, past electronic correspondence of the wife, calendar entries of the wife, etc.) and formulate an answer as described herein. A privacy threshold for this request may be determined to be relatively high, because the wife likely has a high level of trust for the husband. Consequently, even if the formulated answer is drawn from multiple, high-sensitivity data sources associated with the wife, the privacy threshold may not be met, and the husband might be provided with one or more restaurant recommendations. Meanwhile, the wife may only be presented with vague output indicative of the husband's request. The output may not identify the husband or the nature of the request, with the goal of allowing the wife to preserve the surprise. By contrast, had a different user, such as the wife's co-worker, requested similar information (restaurant recommendations for the wife), they may or may not have been provided with responsive information, and the wife may have been pushed more detailed information about the request.

Techniques described herein give rise to a variety of technical advantages. Formulating responses to relatively open-ended and/or broad requests enables automated assistants to “hide” individual data points in relatively broad answers, preserving a user's privacy in specific data points. For instance, in the example above, Alice's electronic correspondence may reveal relatively specific data points, such that she has dinner Sunday night at Restaurant A at 7:30 PM and dinner Monday night at Restaurant B at 7:00 PM. However, the ultimate formulated response of “Alice is available for Dinner on Tuesday” provides a satisfactory answer to Dave without divulging more information about Alice's personal life than necessary. As another example, users are able to determine information about other users without actually establishing communications (e.g., telephone calls, electronic correspondence) with the other users, or without having to repeatedly attempt to establish communications with the other users. This may conserve network resources and/or time that might otherwise be spent by users repeatedly trying to connect with one another.

In some implementations, a method performed by one or more processors is provided that includes: receiving a free-form natural language text segment from a first user via a client device operated by the first user, wherein the free-form natural language text segment comprises a request pertaining to a second user; identifying at least first and second data sources that are accessible by an automated assistant to retrieve data associated with the second user, wherein the first and second data sources include sufficient data to respond to the request; determining a first privacy score associated with the first data source and a second privacy score associated with the second data source; determining an aggregate privacy score associated with responding to the request based on the first privacy score and the second privacy score; and causing the client device operated by the first user to respond to the request in response to a determination that the aggregate privacy score associated responding to the request satisfies a privacy criterion established for the second user with respect to the first user.

These and other implementations of technology disclosed herein may optionally include one or more of the following features.

The request may be a request for information and causing the client device to respond to the request for information may comprise causing the client device to output a natural language response to the request for information. Alternatively, the request may be a request to control one or more devices, and causing the device to respond to the request may comprise transmitting instructions to the one or more devices.

In various implementations, the method may further include obtaining a first data point from the first data source and a second data point from the second data source; and formulating the natural language response based on the first data point and the second data point. In various implementations, the first data source may include a calendar database or a location service. In various implementations, the first data source may include a corpus of communications sent or received by the second user. In various implementations, the corpus of communications may be stored locally on a second client device operated by the second user.

In various implementations, determining the first privacy score associated with the first data source may include determining that the first data source is local to a second client computing device operated by the second user. In various implementations, determining the second privacy score associated with the second data source may include determining that the second data source is available on one or more servers that are remote from any client computing device operated by the second user. In various implementations, the first privacy score may have greater influence on the aggregate privacy score than the second privacy score.

In various implementations, the determination that the aggregate privacy score associated with the natural language response satisfies a privacy criterion established for the second user with respect to the first user may include applying data indicative of the first and second data sources as input across a trained machine learning model to generate output, wherein the output is used to determine whether the privacy criterion is satisfied.

In various implementations, the privacy criterion may include a privacy threshold. In various implementations, the privacy threshold may be selected based on a breadth of the request for information pertaining to the second user.

In addition, some implementations include one or more processors of one or more computing devices, where the one or more processors are operable to execute instructions stored in associated memory, and where the instructions are configured to cause performance of any of the aforementioned methods. Some implementations also include one or more non-transitory computer readable storage media storing computer instructions executable by one or more processors to perform any of the aforementioned methods.

It should be appreciated that all combinations of the foregoing concepts and additional concepts described in greater detail herein are contemplated as being part of the subject matter disclosed herein. For example, all combinations of claimed subject matter appearing at the end of this disclosure are contemplated as being part of the subject matter disclosed herein.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of an example environment in which implementations disclosed herein may be implemented.

FIG. 2A and FIG. 2B depict an example scenario of a dialog between a user and an automated assistant in which disclosed techniques are employed, in accordance with various implementations.

FIG. 3 , FIG. 4 , and FIG. 5 depict additional example scenarios in which disclosed techniques may be employed.

FIG. 6 depicts a flowchart illustrating an example method according to implementations disclosed herein.

FIG. 7 illustrates an example architecture of a computing device.

DETAILED DESCRIPTION

Now turning to FIG. 1 , an example environment in which techniques disclosed herein may be implemented is illustrated. The example environment includes a plurality of client computing devices 106 _(1-N). Each client device 106 may execute a respective instance of an automated assistant client 118. One or more cloud-based automated assistant components 119 may be implemented on one or more computing systems (collectively referred to as a “cloud” computing system) that are communicatively coupled to client devices 106 _(1-N) via one or more local and/or wide area networks (e.g., the Internet) indicated generally at 110 ₁.

In various implementations, an instance of an automated assistant client 118, by way of its interactions with one or more cloud-based automated assistant components 119, may form what appears to be, from the user's perspective, a logical instance of an automated assistant 120 with which the user may engage in a human-to-computer dialog. Two instances of such an automated assistant 120 are depicted in FIG. 1 . A first automated assistant 120A encompassed by a dashed line serves a first user 140A operating first client device 106 ₁ and includes automated assistant client 1181 and one or more cloud-based automated assistant components 119. A second automated assistant 120B encompassed by a dash-dash-dot line serves a second user 140B operating another client device 106N and includes automated assistant client 118 _(N) and one or more cloud-based automated assistant components 119. It thus should be understood that each user that engages with an automated assistant client 118 executing on a client device 106 may, in effect, engage with his or her own logical instance of an automated assistant 120. For the sakes of brevity and simplicity, the term “automated assistant” as used herein as “serving” a particular user will refer to the combination of an automated assistant client 118 executing on a client device 106 operated by the user and one or more cloud-based automated assistant components 119 (which may be shared amongst multiple automated assistant clients 118).

The client devices 106 _(1-N) may include, for example, one or more of: a desktop computing device, a laptop computing device, a tablet computing device, a mobile phone computing device, a computing device of a vehicle of the user (e.g., an in-vehicle communications system, an in-vehicle entertainment system, an in-vehicle navigation system), a standalone interactive speaker (which may or may not be equipped with input/output devices such as microphones, cameras, speakers), and/or a wearable apparatus of the user that includes a computing device (e.g., a watch of the user having a computing device, glasses of the user having a computing device, a virtual or augmented reality computing device). Additional and/or alternative client computing devices may be provided.

In some implementations, a given user may communicate with automated assistant 120 utilizing a plurality of client computing devices 106 that collectively from a coordinated “ecosystem” of computing devices. In some such implementations, automated assistant 120 may be considered to “serve” that given user, e.g., endowing automated assistant 120 with enhanced access to user-controlled content (e.g., resources, documents, etc.) for which access is controlled by the “served” user.

For example, in FIG. 1 , a user-controlled resources engine 134 may be implemented on one or computing devices (which again may be collectively referred to as a “cloud”) to control access to resources such as data controlled by each user. In some implementations, user-controlled resources engine 134 may be operably coupled with one or more computing systems that implement automated assistant 120 via one or more local and/or wide area networks (e.g., the Internet) indicated generally at 1102. Additionally or alternatively, user-controlled resources engine 134 may be implemented in whole or in part on the same computing systems that implement automated assistant 120.

In some implementations, user-controlled resources engine 134 may include one or more access control lists (“ACL” in FIG. 1 ) 136 that govern access to various sources of user user-controlled data. In some implementations, access control list 136 may indicate access rights regarding one or more data sources that store data controlled by individual users. Access control lists 136 may take various forms, such as database entries or a list of access control entries, that include indications, for each user, of what content controlled by that user is accessible to others (including the others' automated assistants), how it is accessible (e.g., read, write, etc.), and so forth.

In some implementations, access control lists 136 may include, for each user, a list of privacy thresholds associated with other users. These privacy thresholds may be user-specific, or may be associated with groups of users, classes of users, etc. In some implementations, these privacy thresholds may be compared to aggregate privacy scores associated with responses assembled by automated assistants to determine whether to fulfill a user's request. For example, suppose Bob has a privacy threshold set for Delia of five (e.g., out of ten). Suppose further that Delia issues a request to automated assistant 120 that requires data from three different data sources, and that ultimately generates an aggregate privacy score of six (assuming the aggregate score is determined by summing the individual privacy scores). In some implementations, because the aggregate privacy score of six exceeds the privacy threshold of five, Delia's request may not be fulfilled. Aggregate scores are not limited to sums of individual privacy scores. In various implementations, aggregate scores may be determined from individual privacy scores using other techniques, such as weighted sums, various equations, trained machine learning models, averages/means/medians of multiple privacy scores associated with multiple data sources, and so forth.

User-controlled data may include various data associated with each user, and may come from a variety of different data sources in the cloud and/or stored locally on client devices 106. For example, in FIG. 1 , user-controlled resources engine 134 has access to cloud-based data sources such as an online calendar 142, online emails 144, social media 146, cloud storage 148, and a position coordinate service 150.

Online calendar 142 may include calendar entries and/or other data instances (e.g., reminders, to-do lists, etc.) associated with one or more user accounts. Online emails 144 may include emails and other electronic correspondence (e.g., text messages, social media posts, etc.) associated with one or more user accounts. Cloud storage 148 may store documents associated with various users (and in many cases, with one or more accounts of the user), such as documents the user stores on a so-called “cloud” drive.” Cloud-based data sources may also include services that provide various user data on request, such as position coordinate service 150 which may provide, on request, a particular user's current and/or past location(s). Other data sources not specifically depicted in FIG. 1 may include data related to the user's behavior, such as search query history (e.g., search logs), past conversations with an automated assistant 120, a reminder list, a shopping list, location history, and so forth.

User-controlled data associated with a particular user may be associated with a “user account” of the user. In some instances, a user may sign into his or her user account on one or more client devices (e.g., using various credentials such as a username/password, biometrics, etc.), thereby endowing an automated assistant 120 (including the locally-executing client 118 and any online components 119) that serves the user with access to these resources. In some cases, automated assistant 120 may gain access to user-controlled data by way of the associated user account. For example, when the user installs or first engages with automated assistant client 118 on a particular client device 106, the user may grant automated assistant 120 permission to access some or all of the user-controlled data. In other words, the user effectively grants automated assistant 120 access to user-controlled data. In some cases, this may include modifying access control list 136 (or other similar security mechanism).

Each of the client computing devices 106 _(1-N) may operate a variety of different applications, such as a corresponding one of a plurality of message exchange clients 107 _(1-N). Message exchange clients 107 _(1-N) may come in various forms and the forms may vary across the client computing devices 106 _(1-N) and/or multiple forms may be operated on a single one of the client computing devices 106 _(1-N). In some implementations, one or more of the message exchange clients 107 _(1-N) may come in the form of a short messaging service (“SMS”) and/or multimedia messaging service (“MMS”) client, an online chat client (e.g., instant messenger, Internet relay chat, or “IRC,” etc.), a messaging application associated with a social network, a personal assistant messaging service dedicated to conversations with automated assistant 120, and so forth. In some implementations, one or more of the message exchange clients 107 _(1-N) may be implemented via a webpage or other resources rendered by a web browser (not depicted) or other application of client computing device 106.

As described in more detail herein, automated assistant 120 engages in human-to-computer dialog sessions with one or more users via user interface input and output devices of one or more client devices 106 _(1-N). In some implementations, automated assistant 120 may engage in a human-to-computer dialog session with a user in response to user interface input provided by the user via one or more user interface input devices of one of the client devices 106 _(1-N). In some of those implementations, the user interface input is explicitly directed to automated assistant 120. For example, one of the message exchange clients 107 _(1-N) may be a personal assistant messaging service dedicated to conversations with automated assistant 120 and user interface input provided via that personal assistant messaging service may be automatically provided to automated assistant 120. Also, for example, the user interface input may be explicitly directed to automated assistant 120 in one or more of the message exchange clients 107 _(1-N) based on particular user interface input that indicates automated assistant 120 is to be invoked. For instance, the particular user interface input may be one or more typed characters (e.g., @AutomatedAssistant), user interaction with a hardware button and/or virtual button (e.g., a tap, a long tap), an oral command (e.g., “Hey Automated Assistant”), and/or other particular user interface input. In some implementations, automated assistant 120 may engage in a dialog session in response to user interface input, even when that user interface input is not explicitly directed to automated assistant 120. For example, automated assistant 120 may examine the contents of user interface input and engage in a dialog session in response to certain terms being present in the user interface input and/or based on other cues.

Each of the client computing devices 106 _(1-N) and computing devices used to implement automated assistant 120 may include one or more memories for storage of data and software applications, one or more processors for accessing data and executing applications, and other components that facilitate communication over a network. The operations performed by one or more of the client computing devices 106 _(1-N) and/or by computing devices that implement automated assistant 120 may be distributed across multiple computer systems. Automated assistant 120 may be implemented as, for example, computer programs running on one or more computers in one or more locations that are coupled to each other through a network.

Automated assistant 120 (and in particular, cloud-based automated assistant components 119) may include intent matcher 135, a text-to-speech (“TTS”) module 116, a speech-to-text (“STT”) module 117, and other components that are described in more detail below. In some implementations, one or more of the modules and/or modules of automated assistant 120 may be omitted, combined, and/or implemented in a component that is separate from automated assistant 120. In some implementations, to protect privacy, one or more of the components of automated assistant 120, such as natural language processor 122, TTS module 116, STT module 117, etc., may be implemented at least on part on client devices 106 (e.g., to the exclusion of the cloud).

STT module 117 may be configured to convert audio captured by automated assistant client 118 into text and/or to other representations or embeddings, e.g., using STT processing techniques. In some implementations, STT module 117 may be configured to leverage the virtually limitless resources of the cloud to convert audio data captured by speech capture module 110 into text, which may then be provided to intent matcher 135. In some implementations, STT module 117 may convert an audio recording of speech to one or more phonemes, and then convert the one or more phonemes to text. Additionally or alternatively, in some implementations, STT module 117 may employ a state decoding graph. In some implementations, STT module 117 may generate a plurality of candidate textual interpretations of the user's utterance. In some implementations, STT module 117 may weight or bias particular candidate textual interpretations higher than others depending on whether there are other cues detected contemporaneously, e.g., by misc. cues module 112.

Misc. cues module 112 may detect a variety of cues other than audible cues, such as visual cues detected by a vision sensor (not depicted, e.g., a camera or passive infrared sensor) on client device 106. For example, a user could hold up some predetermined number of fingers when issuing a vocal request to automated assistant, and the number of fingers may be detected as a cue that is used as a parameter for the user's request. Other types of cues that may be detected by module 112 include, but are not limited to, location cues (e.g., from position coordinate sensors), wireless signals (e.g., Bluetooth, Wi-Fi, cellular), and so forth. In some implementations, TTS module 116 may be configured to convert text to computer-synthesized speech, e.g., using one or more voice synthesizers that may be, for instance, selected by a user, selected automated based on a user's region and/or demographics, etc. And as noted elsewhere herein, all or parts of modules 116, 117, and 112 may be implemented on client device 106, in addition to or instead of on the cloud.

In some implementations, automated assistant 120 generates responsive content in response to various inputs generated by a user of one of the client devices 106 during a human-to-computer dialog session with automated assistant 120. Automated assistant 120 may provide the responsive content (e.g., over one or more networks when separate from a client device of a user) for presentation to the user as part of the dialog session. For example, automated assistant 120 may generate responsive content in response to free-form natural language input provided via client device 106. As used herein, free-form input is input that is formulated by a user and that is not constrained to a group of options presented for selection by the user.

As used herein, a “dialog session” may include a logically-self-contained exchange of one or more messages between a user and automated assistant 120 (and in some cases, other human participants). Automated assistant 120 may differentiate between multiple dialog sessions with a user based on various signals, such as passage of time between sessions, change of user context (e.g., location, before/during/after a scheduled meeting, etc.) between sessions, detection of one or more intervening interactions between the user and a client device other than dialog between the user and the automated assistant (e.g., the user switches applications for a while, the user walks away from then later returns to a standalone voice-activated product), locking/sleeping of the client device between sessions, change of client devices used to interface with one or more instances of automated assistant 120, and so forth.

An intent matcher 135 may be configured to determine a user's intent based on input(s) (e.g., vocal utterances, visual cues, other cues from module 112, etc.) provided by the user and/or based on other signals, such as sensor signals, online signals (e.g., data obtained from web services), and so forth. In some implementations, intent matcher 135 may include a natural language processor 122 and the aforementioned misc. cues module 112.

Natural language processor 122 may be configured to process natural language input generated by user(s) via client device 106 and may generate annotated output (e.g., in textual form) for use by one or more other components of automated assistant 120. For example, the natural language processor 122 may process natural language free-form input that is generated by a user via one or more user interface input devices of client device 106. The generated annotated output includes one or more annotations of the natural language input and one or more (e.g., all) of the terms of the natural language input.

In some implementations, the natural language processor 122 is configured to identify and annotate various types of grammatical information in natural language input. For example, the natural language processor 122 may include a morphological module that may separate individual words into morphemes and/or annotate the morphemes, e.g., with their classes. Natural language processor 122 may also include a part of speech tagger configured to annotate terms with their grammatical roles. For example, the part of speech tagger may tag each term with its part of speech such as “noun,” “verb,” “adjective,” “pronoun,” etc. Also, for example, in some implementations the natural language processor 122 may additionally and/or alternatively include a dependency parser (not depicted) configured to determine syntactic relationships between terms in natural language input. For example, the dependency parser may determine which terms modify other terms, subjects and verbs of sentences, and so forth (e.g., a parse tree)—and may make annotations of such dependencies.

In some implementations, the natural language processor 122 may additionally and/or alternatively include an entity tagger (not depicted) configured to annotate entity references in one or more segments such as references to people (including, for instance, literary characters, celebrities, public figures, etc.), organizations, locations (real and imaginary), and so forth. In some implementations, data about entities may be stored in one or more databases, such as in a knowledge graph (not depicted). In some implementations, the knowledge graph may include nodes that represent known entities (and in some cases, entity attributes), as well as edges that connect the nodes and represent relationships between the entities. For example, a “banana” node may be connected (e.g., as a child) to a “fruit” node,” which in turn may be connected (e.g., as a child) to “produce” and/or “food” nodes. As another example, a restaurant called “Hypothetical Café” may be represented by a node that also includes attributes such as its address, type of food served, hours, contact information, etc. The “Hypothetical Café” node may in some implementations be connected by an edge (e.g., representing a child-to-parent relationship) to one or more other nodes, such as a “restaurant” node, a “business” node, a node representing a city and/or state in which the restaurant is located, and so forth.

The entity tagger of the natural language processor 122 may annotate references to an entity at a high level of granularity (e.g., to enable identification of all references to an entity class such as people) and/or a lower level of granularity (e.g., to enable identification of all references to a particular entity such as a particular person). The entity tagger may rely on content of the natural language input to resolve a particular entity and/or may optionally communicate with a knowledge graph or other entity database to resolve a particular entity.

In some implementations, the natural language processor 122 may additionally and/or alternatively include a coreference resolver (not depicted) configured to group, or “cluster,” references to the same entity based on one or more contextual cues. For example, the coreference resolver may be utilized to resolve the term “there” to “Hypothetical Café” in the natural language input “I liked Hypothetical Café last time we ate there.”

In some implementations, one or more components of the natural language processor 122 may rely on annotations from one or more other components of the natural language processor 122. For example, in some implementations the named entity tagger may rely on annotations from the coreference resolver and/or dependency parser in annotating all mentions to a particular entity. Also, for example, in some implementations the coreference resolver may rely on annotations from the dependency parser in clustering references to the same entity. In some implementations, in processing a particular natural language input, one or more components of the natural language processor 122 may use related prior input and/or other related data outside of the particular natural language input to determine one or more annotations.

Intent matcher 135 may use various techniques to determine an intent of the user, e.g., based on output from natural language processor 122 (which may include annotations and terms of the natural language input) and/or based on output from misc. cues module 112. In some implementations, intent matcher 135 may have access to one or more databases (not depicted) that include, for instance, a plurality of mappings between grammars, other cues, and responsive actions (or more generally, intents). In many cases, these grammars may be selected and/or learned over time, and may represent the most common intents of users. For example, one grammar, “play <artist>”, may be mapped to an intent that invokes a responsive action that causes music by the <artist> to be played on the client device 106 operated by the user. Another grammar, “[weather|forecast] today,” may be match-able to user queries such as “what's the weather today” and “what's the forecast for today?”

In addition to or instead of grammars, in some implementations, intent matcher 135 may employ one or more trained machine learning models, alone or in combination with one or more grammars and/or other (e.g., visual) cues. These trained machine learning models may also be stored in one or more databases and may be trained to identify intents, e.g., by embedding data indicative of a user's utterance and/or any detected user-provided other (e.g., visual) cues into a reduced dimensionality space, and then determining which other embeddings (and therefore, intents) are most proximate, e.g., using techniques such as Euclidean distance, cosine similarity, etc.

As seen in the “play <artist>” example grammar, some grammars have slots (e.g., <artist>) that can be filled with slot values (or “parameters”). Slot values may be determined in various ways. Often users will provide the slot values proactively. For example, for a grammar “Order me a<topping>pizza,” a user may likely speak the phrase “order me a sausage pizza,” in which case the slot <topping> is filled automatically. Additionally or alternatively, if a user invokes a grammar that includes slots to be filled with slot values, without the user proactively providing the slot values, automated assistant 120 may solicit those slot values from the user (e.g., “what type of crust do you want on your pizza?”). In some implementations, slots may be filled with slot values based on other cues detected by misc. cues modules 112. For example, a user could utter something like “Order me this many cat bowls” while holding up three fingers to a visual sensor (not depicted) of client device 106. Or, a user could utter something like “Find me more movies like this” while holding of a DVD case for a particular movie.

In some implementations, automated assistant 120 may serve as an intermediary between users and one or more third party computing services (or “third party agents”, or “agents”, not depicted). These third party computing services may be independent software processes that receive input and provide responsive output. Some third party computing services may take the form of third party applications that may or may not operate on computing systems that are separate from those that operate, for instance, cloud-based automated assistant components 119. One kind of user intent that may be identified by intent matcher 135 is to engage a third party computing service. For example, automated assistant 120 may provide access to an application programming interface (“API”) to a service for controlling a smart device. A user may invoke automated assistant 120 and provide a command such as “I'd like to turn the heating on.” Intent matcher 135 may map this command to a grammar that triggers automated assistant 120 to engage with the third party service, thereby to cause the user's heating to be switched on. The third party service may provide automated assistant 120 with a minimum list of slots that need to be filled in order to fulfill (or “resolve”) a command to turn the heating on. In this example, the slots may include the temperature to which the heating is to be set, and a duration for which the heating is to be on. Automated assistant 120 may generate and provide to the user (via client device 106) natural language output that solicits parameters for the slots.

Fulfillment module 124 may be configured to receive the predicted/estimated intent that is output by intent matcher 135, as well as an associated slot values (whether provided by the user proactively or solicited from the user) and fulfill (or “resolve”) the intent. In various implementations, fulfillment (or “resolution”) of the user's intent may cause various fulfillment information (also referred to as “responsive” information or “resolution information”) to be generated/obtained, e.g., by fulfillment module 124. As will be described below, the fulfillment information may in some implementations be provided to a natural language generator (“NLG” in some FIGS. 126 , which may generate natural language output based on the fulfillment information.

Fulfillment (or “resolution”) information may take various forms because an intent can be fulfilled (or “resolved”) in a variety of ways. Suppose a user requests pure information, such as “Where were the outdoor shots of ‘The Shining’ filmed?” The intent of the user may be determined, e.g., by intent matcher 135, as being a search query. The intent and content of the search query may be provided to fulfillment module 124, which may be in communication with one or more search modules (not depicted) configured to search corpuses of documents and/or other data sources (e.g., knowledge graphs, etc.) for responsive information. Fulfillment module 124 may provide data indicative of the search query (e.g., the text of the query, a reduced dimensionality embedding, etc.) to a search module (not depicted). The search module may provide responsive information, such as GPS coordinates, or other more explicit information, such as “Timberline Lodge, Mt. Hood, Oregon.” This responsive information may form part of the fulfillment information generated by fulfillment module 124.

Additionally or alternatively, fulfillment module 124 may be configured to receive, e.g., from natural language understanding module 135, a user's intent and any slot values provided by the user or determined using other means (e.g., GPS coordinates of the user, user preferences, etc.) and trigger a responsive action. Responsive actions may include, for instance, ordering a good/service, starting a timer, setting a reminder, initiating a phone call, playing media, sending a message, etc. In some such implementations, fulfillment information may include slot values associated with the fulfillment, confirmation responses (which may be selected from predetermined responses in some cases), etc.

Natural language generator 126 may be configured to generate and/or select natural language output (e.g., words/phrases that are designed to mimic human speech) based on data obtained from various sources. In some implementations, natural language generator 126 may be configured to receive, as input, fulfillment information associated with fulfillment of an intent, and to generate natural language output based on the fulfillment information. Additionally or alternatively, natural language generator 126 may receive information from other sources, such as third party applications (e.g., required slots), which it may use to compose natural language output for the user.

As noted previously, a single data source may not have sufficient data to accurately respond to a request pertaining to a user. For example, user 140A may not have a habit of keeping after-work plans in his online calendar 142. If user 140B were to ask automated assistant 120 about user 140A's availability for dinner, and automated assistant 120 could only check online calendar 142, automated assistant might incorrectly inform user 140B that user 140A is available on a particular night, when in fact user 140A has plans that simply did not end up in his calendar. More generally, when users ask automated assistant 120 for information about other users, those requests are often broad and/or open-ended, and therefore may not be resolvable using a single data source.

Accordingly, in various implementations, fulfillment module 124 may generate fulfillment information, and/or natural language generator 126 may formulate natural language output, based on multiple data points retrieved from multiple different data sources, such as two or more of 142-150. That way it does not matter that online calendar 142 does not store sufficient information about the evening plans of user 140A to inform another user, such as user 140B, of whether user 140A is available to meet after work sometime soon. User 140A may exchange email or other electronic correspondence (144), and/or may update his status or communicate with others over social media (146), about his evening plans. By consulting with these additional data sources, in addition to or instead of online calendar 142, automated assistant 120 may be able to respond more effectively/accurately to a request from another user about the evening plans of user 140A.

In some implementations, automated assistant 120, e.g., by way of fulfillment module 124 and/or natural language generator 126, may formulate a natural language response based on the multiple data from the multiple data sources, and this natural language response may be associated with an aggregate privacy score. A determination may be made of whether the aggregate data score satisfies some criterion, such as not exceeding a privacy threshold. If the criterion is satisfied (e.g., the aggregate privacy score does not exceed the privacy threshold), the formulated natural language response may be output by the automated assistant to the requesting user. Otherwise the request may be denied.

Some data sources may store data that is deemed by users to be more sensitive and/or private than others. Accordingly, various techniques described herein are usable to aggregate individual privacy scores associated with these data sources and/or data obtained from these data sources, and to determine whether (or how specifically) to respond to the request based on the aggregate privacy score. For example, data sources that are available online, e.g., on a “cloud” computing system, may have lower privacy scores than, say, data sources that are only available locally on one or more client devices operated by a user. As another example, users may explicitly assign privacy scores to different data sources. For example, a user may elect to make her data from online calendar 142 less private than, say, emails from email data source 144. In some implementations, some data sources may arbitrarily or by default be assigned different privacy scores, e.g., based on general notions of privacy and/or sensitivity. For example, most users would likely agree that their personal electronic correspondence (e.g., emails, text messages) stored in 144 are more private than, say, data sources that are at least partially available to others, such as social network profiles available from 146. As another example, a user's browsing and/or search history would be considered by most users to be more private than say, a user's song playlist or restaurants that the user has recommended to others.

FIGS. 2A and 2B demonstrate one example of how a human-to-computer dialog session between user 101 and an instance of automated assistant (120A or B in FIG. 1 , not depicted in FIG. 2 ) may occur, via the microphone(s) and speaker(s) of a client computing device 206 (depicted as a standalone interactive speaker but this is not meant to be limiting) according to implementations described herein. One or more aspects of automated assistant 120 may be implemented on the computing device 206 and/or on one or more computing devices that are in network communication with the computing device 206.

In FIG. 2A, user 101 (“Dave”) provides natural language input of “Hey Sarah's assistant, is Sarah available for lunch this week?” in a human-to-computer dialog session between the user 101 and automated assistant 120. In response to Dave's addressing Sarah's assistant (“Hey Sarah's assistant”), in some implementations, automated assistant 120 may transition into a mode in which it attempts to mimic Sarah's experience when she engages with automated assistant 120. For example, in some implementations, automated assistant 120 may activate the same voice synthesizer as is used by Sarah when she engages with automated assistant 120. Assuming Sarah prefers a different voice synthesizer for her interactions with automated assistant 120 than Dave, using Sarah's preferred synthesizer when providing natural language output to Dave will provide Dave an experience akin to speaking with Sarah's assistant, rather than with his own.

Dave's request also seeks Sarah's availability for lunch this week. In various implementations, automated assistant 120 may interact with user-controlled resources engine 134 to consult with multiple data sources to determine Sarah's availability, and/or whether Dave should be provided with a response. FIG. 2B depicts examples of multiple data sources that may be consulted to determine Sarah's availability lunch. In this example these data sources include Sarah's electronic calendar 252 (which may be stored, for instance, in 142), an email message exchange thread 254 between Sarah and another user named Mavis (obtained from 144), and Sarah's current or last-known location 256 (which in some implementations may be acquired from position coordinate service 150). Additional or alternative data sources may be considered for any given scenario.

Assume for this example that Dave and Sarah are family members or close friends. Consequently, Sarah may have a relatively lenient or permissive privacy criterion set for Dave. For instance, Sarah may have selected a relatively high privacy threshold for Dave of, for instance, nine of ten. In some implementations this privacy threshold may be stored in ACL 136, e.g., in association with Sarah's user profile. Suppose further that Sarah has set, for her online calendar 252, a privacy score of two, and that Sarah has set, for her message exchange 254 and current location 256, privacy scores of three each. These privacy scores may indicate that Sarah considers her emails and current location to be more sensitive than her online calendar. In some implementations, Sarah may set these scores manually. Additionally or alternatively, in some implementations, these scores may be set in other ways, such as by default. Moreover, these scores may vary depending on users and/or the context from which the information is gathered. For example, suppose that message exchange thread 254 was drawn from Sarah's social media page, rather than from her private emails. In such a scenario, a privacy score for social media messages may, in some cases, be lower than email, such as two or even lower (especially if the message exchange occurred on a publicly-viewable portion of Sarah's social media profile).

Suppose it is currently Monday morning when Dave submits his request, and that Dave will be located on the west coast of the United States throughout the week (e.g., determined from his own calendar and/or other data sources). To determine when Sarah is available for lunch the remainder of the week, all three sources 252-256 may be consulted, e.g., by fulfillment module 124. Sarah's online calendar 252 eliminates Thursday from contention, leaves open the remainder of the week, and triggers a first privacy score of two. Sarah's message exchange thread 254 eliminates Tuesday from contention, and triggers a second privacy score of three. And given the fact that Sarah's current location 256 is in Japan (triggering a third privacy score of three), lunch on Monday is also out of the question. The only days in which Sarah is available for lunch are Wednesday and Friday.

With this information, automated assistant 120, e.g., by way of natural language generator 126, may formulate an appropriate natural language response. However, before this occurs, automated assistant 120 may compare an aggregate privacy score—e.g., a sum of the first, second, and third privacy scores mentioned above—to Sarah's privacy threshold for Dave. The aggregate score is eight (2+3+3) and the threshold is nine. Accordingly, and referring back to FIG. 2A, automated assistant 120 responds, “Let me check . . . Sarah appears to be available for lunch on Wednesday and Friday.” However, if Dave and Sarah were not as close, and Sarah had a lower privacy threshold set for Dave, then the aggregate privacy score (eight) might meet or exceed the threshold, in which case automated assistant 120 might reply, “I'm sorry Dave, I'm afraid I can't do that.” In some implementations, Sarah also may or may not be notified of Dave's request and/or resulting response.

Privacy thresholds for particular users or groups of users need not be static, nor are they required to always be the same for a particular user. In various implementations, privacy thresholds may be dynamic, e.g., generated or calculated on the fly. This is particularly beneficial because users are not required to manually set permissions for all other users. Rather, privacy thresholds can be determined automatically, based on a variety of signals and using a variety of techniques. In some implementations, a privacy threshold for a requesting user may be determined at the time of the requesting user's request, e.g., using one or more trained machine learning models. For example, various attributes of the requesting user and/or their request, their context, the subject user's context, the data sources required to fulfill the request, etc., may be used to assemble a feature vector associated with the request (or the user). This feature vector may then be embedded into a latent space (also referred to as a “reduced dimensionality embedding”) that also includes embeddings of other requests (or users). Euclidian distance(s) between the various embeddings may be determined. In some implementations, privacy thresholds associated with the “closest” other requests in the latent space may be used to determine the privacy threshold for the current request (or for the requesting user), e.g., as an average or median of those scores.

In some implementations, a history of requests from a particular user may be considered when determining a privacy threshold for the user and/or their request. Using brute force, a malicious user could string together a multitude of individual requests, each by itself being relatively innocuous, but the information provided in response to all the requests collectively could be more revealing than a subject user may desire. As an example, a malicious user could ask, “Is John on vacation on May 1^(st)? Is John on vacation May 2^(nd)?,” etc., to ascertain a general idea of John's comprehensive schedule, which John may not wish to disclose. Accordingly, in some implementations, a requesting user's privacy threshold may decrease (i.e., become more easily violated) the more questions they ask, especially in a particular time period (e.g., within a few minutes, an hour, a day, etc.).

Additionally or alternatively, in some implementations, a requesting user's privacy threshold may be determined based on a breadth of their request, i.e., a measure of specificity or granularity associated with the request. Put another way, the breadth of the requesting user's request may be used to determine how strictly it should be scrutinized for privacy concerns. This may reduce the likelihood of the requesting user being able to infer specific pieces of information about the other user from general answers.

For example, a request that seeks highly specific information (e.g., “Where will Delia be at 11 PM tomorrow night?”) may be subject to relatively strict scrutiny. The privacy threshold may be set relatively low, and therefore, may be more easily matched and/or exceeded (in which case the request would be denied). By contrast, a request seeking coarser, less specific information (e.g., “Is Findlay available for Dinner tomorrow or Wednesday?”) may be subject to less strict scrutiny. For example, the privacy threshold may be set relatively high, and therefore, may be more difficult to violate. As another example, a general or broad request such as “Does George like historical fiction?” may be subjected to less scrutiny (e.g., an aggregate privacy score associated with the response may be compared to a relatively high privacy threshold) than, say, a highly specific request such as “Does George already own an electronic copy of ‘Gone with the Wind’?” As another example, a relatively broad request such as “Does Antoine like seafood?” may be subjected to less scrutiny than, say, a highly-specific request such as “How often does Antoine eat seafood?”

In some implementations, a request's breadth may be determined based at least in part on the resulting fulfillment information (which, recall, may be used to generate natural language output). For example, the number of distinct data sources required to fulfill the request may be considered, e.g., with the greater number of data sources required being associated with a greater breadth than, say, a relatively low number of data sources. Intuitively, the more data sources drawn from to generate fulfillment information, the more difficult it is to infer a particular piece of data being from a particular source.

Additionally or alternatively, in some implementations, a request's breadth may be determined based on aspects of the request itself. For example, in some implementations, the number of terms in the request may be considered, e.g., with less terms being indicative of greater breadth, and vice versa. As another example, the number of times a request is encountered, e.g., across a population of users, may be considered. In some such implementations, the more frequently the same request or semantically/syntactically similar requests are encountered, the greater the request's breadth, and vice versa.

FIG. 3 sets up an alternative to the scenario depicted in FIGS. 2A-2B. Rather than formulating a response to Dave's FIG. 2A request from three separate data sources, in FIG. 3 , a response is formulated from a single data source—Sarah's online calendar 252. In this example, Sarah has created calendar entries that indicate lunch conflicts Monday, Tuesday, and Thursday. While it is still possible to determine that Sarah is available for lunch on Wednesday and Friday from online calendar 252, this determination is now made from a single data source. Consequently, in some implementations, Dave's request may be considered relatively narrow, and the privacy threshold vis-à-vis Dave and his request may therefore be set relatively low, e.g., much lower than the scenario depicted in FIG. 2B. It might be the case that the lowered threshold results in Dave's request being denied. However, that is not guaranteed, especially since Sarah's online calendar 252 has a relatively low privacy score of two, which means Dave's request might be granted even with the lowered privacy threshold generated based on the narrow breadth of his request.

FIG. 4 depicts another dialog between the user Dave 101 and his automated assistant 120 operating on a computing device 406A during a different session. In this example, Dave provides the free-form natural language input request, “Hey Sarah's assistant, does Sarah like Science Fiction?” In this example, automated assistant 120 consults four different data sources to determine that Sarah does like science fiction, and to formulate the response, “Yes, Sarah appears to enjoy science fiction.” Two of the data sources are cloud-based, and include an online media profile 480 and the aforementioned social media 146. Online media profile 480 may contain information about books, movies, podcasts, etc. that have been or are to be recommended to Sarah based on various signals, such as her shopping history, search history, media consumption history, etc. Social media 146 may include, for instance, comments made by Sarah on her status page or to other social media users that are useful for gauging her interest in science fiction (e.g., “I loved the original ‘Alien’ movie, and the first sequel.”). It could also include, for instance, comments made by Sarah on various message threads, such as comments at the end of articles, etc.

Two additional data sources in FIG. 4 are available locally on a client device 406B operated by Sarah. These include a search/browsing history 482 and locally-stored media 484. For example, Sarah's searching and/or browsing history may reveal a likely interest by Sarah in science fiction. Additionally, if media stored locally on Sarah's client device 406B includes substantial science fiction content (e.g., determined from metadata), that may also indicate an interest by Sarah in science fiction. In some implementations, data sources that are only available locally on client devices, such as 482-484 in FIG. 4 , may be deemed more private and/or sensitive than other data sources available, for instance, on the cloud (e.g., 480, 146). Consequently, these local data sources may have higher privacy scores associated with them than other online sources.

In FIG. 4 , data is drawn from all four data sources to determine that Sarah likes science fiction, as indicated by the arrows. In some implementations, drawing data from such a large number of data sources results in the request being interpreted as having relatively large breadth. This in turn may result in a relatively high privacy threshold (difficult to violate) being established, at least for this particular request from Dave. But that isn't to say Dave always will be according such a high privacy threshold when requesting information about Sarah.

For example, in FIG. 5 (in which the components are the same as in FIG. 4 ), Dave makes a much narrower request, “has Sarah read ‘Rendezvous with Rama’?” In this instance, automated assistant 120 is able to determine, from a single data source, that Sarah has read that book. In particular the single data source is locally stored media 484 of Sarah's client device 406B, where Sarah might have an electronic copy of the book stored (and in some cases it may be labeled with metadata indicating that Sarah has read it). The other data sources depicted in FIG. 5 (580, 146, 482) didn't provide any help in answering Dave's request. Accordingly, even though an answer to Dave's request was ascertained, in FIG. 5 , automated assistant 120 tells Dave that it cannot provide that information. This may be because, for instance, Dave's request was interpreted as having narrow breadth, e.g., due to it being answered based on data obtained from a single data source (484).

As noted previously, in some implementations, Sarah may or may not be notified of Dave's request and/or whether the request was fulfilled. In the above example Dave may be looking for a birthday for present for Sarah. Notifying Sarah of Dave's request about “Rendezvous with Rama” may clue Sarah in to the fact that Dave is shopping for her birthday present, and that he's likely to get her a science fiction book. Accordingly, in some implementations, Sarah may receive no notification, or may receive a push notification (e.g., a pop up card on her lock screen) that indicates Dave made a request about her, but that doesn't inform her about the specific request. That way Sarah can avoid reading Dave's specific request, e.g., so that she can still be surprised by his present. In some implementations, automated assistant 120 may determine, e.g., from Sarah's calendar, that Sarah's birthday (or another present-giving occasion) is going to occur soon. Based on that determination, automated assistant 120 may determine that Dave's request likely relates to purchase of a birthday present for Sarah, and thereby might take various steps to avoid spoiling Sarah's surprise, such as by not notifying Sarah of the request, obscuring the request, leaving the notification of the request vague or ambiguous, etc.

FIG. 6 is a flowchart illustrating an example method 600 according to implementations disclosed herein. For convenience, the operations of the flow chart are described with reference to a system that performs the operations. This system may include various components of various computer systems, such as one or more components of automated assistant 120. Moreover, while operations of method 600 are shown in a particular order, this is not meant to be limiting. One or more operations may be reordered, omitted or added.

At block 602, the system may receive a free-form natural language text segment from a first user (e.g., 140A) via a client device (e.g., 106 ₁) operated by the first user. In various implementations, the free-form natural language text segment may include a request for information pertaining to a second user (e.g., 140B). For example, the requested information may be information that can be formulated based on data created by and/or wholly or partially under the control of the second user. The request may be received as speech that is then converted to text (e.g., by module 117) and/or as typed textual input. In some implementations, the request may be submitted by a first user (caller) who is attempting to make a telephone call (e.g., using cellular, VOIP, etc.) to a second user. If the second user is not available to take a call, the first user may be connected to an automated assistant that may or may not operate at least in part on the first user's smart phone or the second user's smart phone.

In many implementations, the request may be targeted by the first user to the second user's automated assistant. As noted above, in some implementations, each user may not actually have a distinct automated assistant that serves them. Rather, each user may have an automated assistant client 118 that interfaces with cloud-based automated assistant components 119 to provide the user with an experience akin to having their own personalized virtual assistant. To this end, in some implementations, each user may select attributes of their automated assistant, such as a voice synthesizer to be employed by their automated assistant. Consequently, in some implementations when a first user attempts to engage with an automated assistant that serves a second user, a voice synthesizer selected by the second user when they engage with automated assistant 120 may be used to communicate with the first user, thereby giving the illusion to the first user of speaking with the second user's automated assistant.

In some implementations, a requesting user may ask their own assistant to ask someone else's assistant for information (e.g., “Hey assistant, will you ask Sarah's assistant if she likes science fiction?”). Additionally or alternatively, in some implementations, a user may engage with another user's assistant by calling the other user's telephone (or, more generally, attempting to establish some sort of voice communication session with the other user) while the other user is busy, on another call, etc. The calling user may be presented with an automated assistant interface that mimics the other user's automated assistant, at which point the calling user can make requests. And requests are not limited to voice-based requests. In various implementations, a user may engage with another user's automated assistant using other input/output modalities, such as visual (e.g., using message exchange application 107).

Referring back to FIG. 6 , at block 604, the system may identify at least first and second data sources that are accessible by automated assistant 120 to retrieve data associated with the second user. In various implementations, the first and second data sources (and any number of additional resources as necessary) may collectively include sufficient data to generate responsive fulfillment information and/or formulate a natural language response to the request for information, whereas neither of the sources might have had sufficient data alone.

At block 606, the system may determine a first privacy score associated with the first data source and a second privacy score associated with the second data source. At block 608, the system may determine an aggregate privacy score associated with responding to the request for information. In some implementations, this aggregate score may be based on the first privacy score and the second privacy score, e.g., a sum of the two scores. In some implementations, when fulfillment module 124 assembles the fulfillment information necessary for natural language generator 126 to formulate a natural language response, fulfillment module 124 may attach the aggregate privacy score to the fulfillment information.

As noted above, privacy scores associated with data sources (e.g., 142-150, 252-256, 480-484) may be selected by the user, set by default, learned over time (e.g., using machine learning models), and so forth. Additionally or alternatively, in some implementations, privacy scores for each data source may be weighted, e.g., based on a number of individual data points drawn from that particular data source relative to other data sources. For example, if a user's online calendar is used to determine that they are unavailable for dinner on three days, and the user's emails are used to determine that the user is unavailable on a fourth day, the user's online calendar may be weighted more or less heavily than the user's email.

At block 610, the system may determine whether that aggregate privacy score determined at block 608 satisfies a privacy criterion. As noted above, in some implementations, the privacy criterion may take the form of a privacy threshold. A privacy threshold may be set for particular users (e.g., Sarah sets a privacy threshold for any request from Dave) or requests, and/or may be determined dynamically, e.g., based on a breadth of the request, a number of data sources required to fulfill the request, etc. In some implementations, satisfying the privacy criterion means not meeting or exceeding the privacy threshold.

If the answer at block 610 is yes, then at block 612, the system may cause the natural language response to be formulated and/or output at the client device operated by the first user. The natural language response may be output in various ways, such as audibly, visually (e.g., by message exchange client 107), and so forth. In some implementations, the user about which the request was made may also be notified of the request and/or its fulfillment. However, if the answer at block 610 is no, then at block 614, the system may cause the client device to output other natural language output denying the request received at block 602. Similar to block 612, in some implementations, the user about which the rejected request was made be notified of the request and/or its denial. And as noted above, in some implementations, the subject user may or may not be notified of the request and/or its fulfillment or denial, depending on whether it would be desirable to maintain some level of surprise for the subject user.

Requests as described herein are not necessarily limited to requests for information. For example, a first user may request that an automated assistant engage with a resource that is controlled by a second user. The automated assistant may only be permitted to engage with that resource if it determines, e.g., using techniques described herein, that the first user should be granted such permission. As a non-limiting example, a child may ask an automated assistant to purchase something from an online marketplace. The automated assistant may determine an aggregate privacy score associated by the request based on a variety of different factors, such as the trustworthiness of the online market place, a privacy score associated with a data source (e.g., mom's credit card), and so forth. This aggregate privacy score may be compared to a privacy threshold established for the child with regard to, for instance, the child's mother or father. Other responsive actions that may be authenticated using techniques described herein include but are not limited to operating home appliances (e.g., should a guest be permitted to adjust the thermostat?), changing lighting scenery, locking/unlocking doors, etc.

FIG. 7 is a block diagram of an example computing device 710 that may optionally be utilized to perform one or more aspects of techniques described herein. In some implementations, one or more of a client computing device, user-controlled resources engine 134, and/or other component(s) may comprise one or more components of the example computing device 710.

Computing device 710 typically includes at least one processor 714 which communicates with a number of peripheral devices via bus subsystem 712. These peripheral devices may include a storage subsystem 724, including, for example, a memory subsystem 725 and a file storage subsystem 726, user interface output devices 720, user interface input devices 722, and a network interface subsystem 716. The input and output devices allow user interaction with computing device 710. Network interface subsystem 716 provides an interface to outside networks and is coupled to corresponding interface devices in other computing devices.

User interface input devices 722 may include a keyboard, pointing devices such as a mouse, trackball, touchpad, or graphics tablet, a scanner, a touchscreen incorporated into the display, audio input devices such as voice recognition systems, microphones, and/or other types of input devices. In general, use of the term “input device” is intended to include all possible types of devices and ways to input information into computing device 710 or onto a communication network.

User interface output devices 720 may include a display subsystem, a printer, a fax machine, or non-visual displays such as audio output devices. The display subsystem may include a cathode ray tube (CRT), a flat-panel device such as a liquid crystal display (LCD), a projection device, or some other mechanism for creating a visible image. The display subsystem may also provide non-visual display such as via audio output devices. In general, use of the term “output device” is intended to include all possible types of devices and ways to output information from computing device 710 to the user or to another machine or computing device.

Storage subsystem 724 stores programming and data constructs that provide the functionality of some or all of the modules described herein. For example, the storage subsystem 724 may include the logic to perform selected aspects of the method of FIG. 6 , as well as to implement various components depicted in FIG. 1 .

These software modules are generally executed by processor 714 alone or in combination with other processors. Memory 725 used in the storage subsystem 724 can include a number of memories including a main random access memory (RAM) 730 for storage of instructions and data during program execution and a read only memory (ROM) 732 in which fixed instructions are stored. A file storage subsystem 726 can provide persistent storage for program and data files, and may include a hard disk drive, a floppy disk drive along with associated removable media, a CD-ROM drive, an optical drive, or removable media cartridges. The modules implementing the functionality of certain implementations may be stored by file storage subsystem 726 in the storage subsystem 724, or in other machines accessible by the processor(s) 714.

Bus subsystem 712 provides a mechanism for letting the various components and subsystems of computing device 710 communicate with each other as intended. Although bus subsystem 712 is shown schematically as a single bus, alternative implementations of the bus subsystem may use multiple busses.

Computing device 710 can be of varying types including a workstation, server, computing cluster, blade server, server farm, or any other data processing system or computing device. Due to the ever-changing nature of computers and networks, the description of computing device 710 depicted in FIG. 7 is intended only as a specific example for purposes of illustrating some implementations. Many other configurations of computing device 710 are possible having more or fewer components than the computing device depicted in FIG. 7 .

In situations in which certain implementations discussed herein may collect or use personal information about users (e.g., user data extracted from other electronic communications, information about a user's social network, a user's location, a user's time, a user's biometric information, and a user's activities and demographic information, relationships between users, etc.), users are provided with one or more opportunities to control whether information is collected, whether the personal information is stored, whether the personal information is used, and how the information is collected about the user, stored and used. That is, the systems and methods discussed herein collect, store and/or use user personal information only upon receiving explicit authorization from the relevant users to do so.

For example, a user is provided with control over whether programs or features collect user information about that particular user or other users relevant to the program or feature. Each user for which personal information is to be collected is presented with one or more options to allow control over the information collection relevant to that user, to provide permission or authorization as to whether the information is collected and as to which portions of the information are to be collected. For example, users can be provided with one or more such control options over a communication network. In addition, certain data may be treated in one or more ways before it is stored or used so that personally identifiable information is removed. As one example, a user's identity may be treated so that no personally identifiable information can be determined. As another example, a user's geographic location may be generalized to a larger region so that the user's particular location cannot be determined.

While several implementations have been described and illustrated herein, a variety of other means and/or structures for performing the function and/or obtaining the results and/or one or more of the advantages described herein may be utilized, and each of such variations and/or modifications is deemed to be within the scope of the implementations described herein. More generally, all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the teachings is/are used. Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific implementations described herein. It is, therefore, to be understood that the foregoing implementations are presented by way of example only and that, within the scope of the appended claims and equivalents thereto, implementations may be practiced otherwise than as specifically described and claimed. Implementations of the present disclosure are directed to each individual feature, system, article, material, kit, and/or method described herein. In addition, any combination of two or more such features, systems, articles, materials, kits, and/or methods, if such features, systems, articles, materials, kits, and/or methods are not mutually inconsistent, is included within the scope of the present disclosure. 

What is claimed is:
 1. A method implemented using one or more processors, comprising: receiving a free-form natural language text segment from a first user via a client device operated by the first user, wherein the free-form natural language text segment comprises a request by the first user for information controlled by a second user; identifying a plurality of data sources that are accessible by one or more automated assistants to retrieve data associated with the second user, wherein the plurality of data sources are controlled by the second user and collectively include sufficient data to ascertain the information controlled by the second user; determining a breadth of the request by the first user for the information controlled by the second user; based on the breadth of the request, establishing a privacy threshold for the second user with respect to the first user; based on the plurality of data sources, determining an aggregate privacy score associated with responding to the request; and causing the client device operated by the first user to respond to the request in response to a determination that the aggregate privacy score associated with responding to the request satisfies the privacy threshold established for the second user with respect to the first user.
 2. The method of claim 1, wherein the breadth is determined based on a count of the plurality of data sources that are required to fulfill the request of the first user for the information controlled by the second user.
 3. The method of claim 1, wherein the breadth is determined based on a number of terms contained in the free-form natural language text segment.
 4. The method of claim 1, wherein causing the client device to respond to the request comprises causing the client device to output a speech-synthesized natural language response.
 5. The method of claim 4, further comprising: identifying a speech synthesizer selected by the second user to engage with one or more of the automated assistants; and utilizing the identified speech synthesizer to synthesize the natural language response.
 6. The method of claim 1, wherein the request for information controlled by the second user comprises a request for a media preference of the second user.
 7. The method of claim 1, wherein the request for information controlled by the second user comprises a request for availability of the second user at a particular time.
 8. The method of claim 1, wherein the plurality of data sources comprise a calendar database or a location service.
 9. The method of claim 1, wherein the plurality of data source comprise a corpus of communications sent or received by the second user.
 10. A system comprising one or more processors and memory storing instructions that, in response to execution by the one or more processors, cause the one or more processors to: receive a free-form natural language text segment from a first user via a client device operated by the first user, wherein the free-form natural language text segment comprises a request by the first user for information controlled by a second user; identify a plurality of data sources that are accessible by one or more automated assistants to retrieve data associated with the second user, wherein the plurality of data sources are controlled by the second user and collectively include sufficient data to ascertain the information controlled by the second user; determine a breadth of the request by the first user for the information controlled by the second user; based on the breadth of the request, establish a privacy threshold for the second user with respect to the first user; based on the plurality of data sources, determine an aggregate privacy score associated with responding to the request; and cause the client device operated by the first user to respond to the request in response to a determination that the aggregate privacy score associated with responding to the request satisfies the privacy threshold established for the second user with respect to the first user.
 11. The system of claim 10, wherein the breadth is determined based on a count of the plurality of data sources that are required to fulfill the request of the first user for the information controlled by the second user.
 12. The system of claim 10, wherein the breadth is determined based on a number of terms contained in the free-form natural language text segment.
 13. The system of claim 10, wherein the instructions to cause the client device to respond to the request comprise instructions to cause the client device to output a speech-synthesized natural language response.
 14. The system of claim 13, further comprising instructions to: identify a speech synthesizer selected by the second user to engage with one or more of the automated assistants; and utilize the identified speech synthesizer to synthesize the natural language response.
 15. The system of claim 10, wherein the request for information controlled by the second user comprises a request for a media preference of the second user.
 16. The system of claim 10, wherein the request for information controlled by the second user comprises a request for availability of the second user at a particular time.
 17. The system of claim 10, wherein the plurality of data sources comprise a calendar database or a location service.
 18. The system of claim 10, wherein the plurality of data source comprise a corpus of communications sent or received by the second user.
 19. At least one non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to: receive a free-form natural language text segment from a first user via a client device operated by the first user, wherein the free-form natural language text segment comprises a request by the first user for information controlled by a second user; identify a plurality of data sources that are accessible by one or more automated assistants to retrieve data associated with the second user, wherein the plurality of data sources are controlled by the second user and collectively include sufficient data to ascertain the information controlled by the second user; determine a breadth of the request by the first user for the information controlled by the second user; based on the breadth of the request, establish a privacy threshold for the second user with respect to the first user; based on the plurality of data sources, determine an aggregate privacy score associated with responding to the request; and cause the client device operated by the first user to respond to the request in response to a determination that the aggregate privacy score associated with responding to the request satisfies the privacy threshold established for the second user with respect to the first user.
 20. The at least one non-transitory computer-readable medium of claim 19, wherein the breadth is determined based on a count of the plurality of data sources that are required to fulfill the request of the first user for the information controlled by the second user. 